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4-Alkoxy-2,2-bis(trifluoromethyl)thietanes, 3 (R=Me and Et), were prepared by the reactions of 2,2,4,4-tetrakis(trifluoromethyl)-1,-dithietane with alkyl vinyl ethers in a KF–DMF system. A bimolecular condensation product, bis[4,4-bis(trifluoromethyl)thietan-2-yl]ether, 5, was obtained by the treatment of 3 with concentrated sulfuric acid. On the other hand, when treated with sulfur in DMF in the presence of diethylamine, 3 gave 5-alkoxy-3,3-bis(trifluoromethyl)-1,2-dithiolanes, 8, in rather good yields. Several reactions of these thietanes and 1,2-dithiolanes, including those with butyllithium, were examined.

The reactions of perfluoroalkyl iodides with allyl, vinyl or aryl halides with ultrasonically dispersed zinc in the presence of palladium catalyst proceeded smoothly to give the corresponding allyl, vinyl or aryl perfluoroalkylides in a good yield.

Rotational correlation time (τc) of nitroxide radical solute was determined in ionic liquids by utilizing CW EPR spectroscopy. The experimental values of τc determined in viscous ionic liquids disagree with the values calculated according to Stokes–Einstein–Debye (SED) equation. A fractional SED law was examined for these solute–solvent combinations.

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